Announcing the task list as you scroll. (Bug 15699050)

Change-Id: I7453f41a2c87241e538cdc7281cdc20a8710ebbb

2 files changed, 64 insertions, 0 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java b/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
index 887cbac..bbd0a0d 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
@@ -56,6 +56,7 @@ import android.view.Display;
 import android.view.DisplayInfo;
 import android.view.SurfaceControl;
 import android.view.WindowManager;
+import android.view.accessibility.AccessibilityManager;
 import com.android.systemui.recents.Constants;
 
 import java.io.IOException;
@@ -73,6 +74,7 @@ public class SystemServicesProxy {
 
     final static BitmapFactory.Options sBitmapOptions;
 
+    AccessibilityManager mAccm;
     ActivityManager mAm;
     IActivityManager mIam;
     AppWidgetManager mAwm;
@@ -97,6 +99,7 @@ public class SystemServicesProxy {
 
     /** Private constructor */
     public SystemServicesProxy(Context context) {
+        mAccm = AccessibilityManager.getInstance(context);
         mAm = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
         mIam = ActivityManagerNative.getDefault();
         mAwm = AppWidgetManager.getInstance(context);
@@ -442,6 +445,15 @@ public class SystemServicesProxy {
     }
 
     /**
+     * Returns whether touch exploration is currently enabled.
+     */
+    public boolean isTouchExplorationEnabled() {
+        if (mAccm == null) return false;
+
+        return mAccm.isEnabled() && mAccm.isTouchExplorationEnabled();
+    }
+
+    /**
      * Returns a global setting.
      */
     public int getGlobalSetting(Context context, String setting) {
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
index dbed136..895b9d1 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
@@ -22,11 +22,15 @@ import android.graphics.Rect;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityManager;
+import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.FrameLayout;
 import com.android.systemui.R;
 import com.android.systemui.recents.Constants;
 import com.android.systemui.recents.RecentsConfiguration;
 import com.android.systemui.recents.misc.DozeTrigger;
+import com.android.systemui.recents.misc.SystemServicesProxy;
 import com.android.systemui.recents.model.RecentsPackageMonitor;
 import com.android.systemui.recents.model.RecentsTaskLoader;
 import com.android.systemui.recents.model.Task;
@@ -67,6 +71,7 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
     DebugOverlayView mDebugOverlay;
     Rect mTaskStackBounds = new Rect();
     int mFocusedTaskIndex = -1;
+    int mPrevAccessibilityFocusedIndex = -1;
 
     // Optimizations
     int mStackViewsAnimationDuration;
@@ -244,6 +249,9 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
     /** Synchronizes the views with the model */
     boolean synchronizeStackViewsWithModel() {
         if (mStackViewsDirty) {
+            RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
+            SystemServicesProxy ssp = loader.getSystemServicesProxy();
+
             // Get all the task transforms
             ArrayList<Task> tasks = mStack.getTasks();
             float stackScroll = mStackScroller.getStackScroll();
@@ -293,6 +301,18 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
                 // Animate the task into place
                 tv.updateViewPropertiesToTaskTransform(mCurrentTaskTransforms.get(taskIndex),
                         mStackViewsAnimationDuration);
+
+                // Request accessibility focus on the next view if we removed the task
+                // that previously held accessibility focus
+                childCount = getChildCount();
+                if (childCount > 0 && ssp.isTouchExplorationEnabled()) {
+                    TaskView atv = (TaskView) getChildAt(childCount - 1);
+                    int indexOfTask = mStack.indexOfTask(atv.getTask());
+                    if (mPrevAccessibilityFocusedIndex != indexOfTask) {
+                        tv.requestAccessibilityFocus();
+                        mPrevAccessibilityFocusedIndex = indexOfTask;
+                    }
+                }
             }
 
             // Reset the request-synchronize params
@@ -432,6 +452,22 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
     }
 
     @Override
+    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
+        super.onInitializeAccessibilityEvent(event);
+        int childCount = getChildCount();
+        if (childCount > 0) {
+            TaskView backMostTask = (TaskView) getChildAt(0);
+            TaskView frontMostTask = (TaskView) getChildAt(childCount - 1);
+            event.setFromIndex(mStack.indexOfTask(backMostTask.getTask()));
+            event.setToIndex(mStack.indexOfTask(frontMostTask.getTask()));
+            event.setContentDescription(frontMostTask.getTask().activityLabel);
+        }
+        event.setItemCount(mStack.getTaskCount());
+        event.setScrollY(mStackScroller.mScroller.getCurrY());
+        event.setMaxScrollY(mStackScroller.progressToScrollRange(mLayoutAlgorithm.mMaxScrollP));
+    }
+
+    @Override
     public boolean onInterceptTouchEvent(MotionEvent ev) {
         return mTouchHandler.onInterceptTouchEvent(ev);
     }
@@ -447,6 +483,8 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
         // Synchronize the views
         synchronizeStackViewsWithModel();
         clipTaskViews();
+        // Notify accessibility
+        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED);
     }
 
     /** Computes the stack and task rects */
@@ -623,6 +661,15 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
                     mStartEnterAnimationCompleted = true;
                     // Start dozing
                     mUIDozeTrigger.startDozing();
+                    // Focus the first view if accessibility is enabled
+                    RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
+                    SystemServicesProxy ssp = loader.getSystemServicesProxy();
+                    int childCount = getChildCount();
+                    if (childCount > 0 && ssp.isTouchExplorationEnabled()) {
+                        TaskView tv = ((TaskView) getChildAt(childCount - 1));
+                        tv.requestAccessibilityFocus();
+                        mPrevAccessibilityFocusedIndex = mStack.indexOfTask(tv.getTask());
+                    }
                 }
             });
         }
@@ -812,6 +859,11 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
     public void prepareViewToEnterPool(TaskView tv) {
         Task task = tv.getTask();
 
+        // Clear the accessibility focus for that view
+        if (tv.isAccessibilityFocused()) {
+            tv.clearAccessibilityFocus();
+        }
+
         // Report that this tasks's data is no longer being used
         RecentsTaskLoader.getInstance().unloadTaskData(task);